OS-CON and POSCAP capacitors are aluminium electrolytic and respectively
tantalum capacitors, with solid electrolyte. The type of solid
electrolyte can be either an organic semiconductor or a conductive
polymer. This second compound differs from the first in its higher
conductance and better temperature behaviour.
The main advantages of OS-CON and POSCAP over aluminium electrolytic and
tantalum liquid electrolyte capacitors lies in:
Better conductivity: lower ESR.
Much better behaviour at lower temperatures.
Higher reliability, specially at high temperatures.
The rated voltage of the capacitor specifies its maximum working
voltage. It is advisable that the nominal working voltage is 80% to 90%
of the rated value for POSCAPs and 80% for OS-CONs so as to been able to
work without damage in the widest set of highest temperatures.
Allowable ripple current
It specifies the maximum current that can be drained off the capacitor
without producing loss of reliability.
Leakage current can increase if stored for long periods of time. In that
case, the rated voltage should be applied at higher temperature and the
capacitor should not be discharged under a strong load.